Abstract
For turbomachineries operating at supercritical shaft speed, it is important to understand the characteristics of unsteady fluid forces on the impeller which occur due to shaft vibration. The present paper treats the forces on an open-type centrifugal impeller in whirling motion using unsteady potential flow theory. The whirling forces obtained agree fairly well with experimental results and show a destabilizing region at small positive whirl. It was found that the destabilizing force is due to the forces on the hub caused by the change in flow thickness, with minor effect of tip leakage on the destabilization.
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